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A comparative is a construction used with an adjective or adverb to express a comparison between two people, places or things. Example: John is shorter than Tom. Legacy High School is as big as Arbor View High School.

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A superlative is a word or construction used with an adjective, adverb, or noun to express the highest or lowest degree or a specific quality among three or more people, places or things. Examples: French IV has the least amount of students enrolled. French class is the most interesting!

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In French, superlatives are formed by placing the appropriate definite article after the noun, when it is expressed, and before the comparative form. The preposition de often follows the superlative to express in or of. Example: Marie est le plus grand de la classe.

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Look at the following two sentences: Marie est plus grand que Sophie. Marie est le plus grand de la classe. The first sentence is using the comparative. The second is using the superlative.